downloads: prevent "Clear all" from removing in progress downloads

chrome/browser/ui/webui/downloads_dom_handler.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 85 matching lines @@
   // depend on WebUI. The other methods that depend on WebUI are
   // RegisterMessages() and HandleDrag().
   virtual content::WebContents* GetWebUIWebContents();
   virtual void CallDownloadsList(const base::ListValue& downloads);
   virtual void CallDownloadUpdated(const base::ListValue& download);
 
   // Schedules a call to SendCurrentDownloads() in the next message loop
   // iteration. Protected rather than private for use in tests.
   void ScheduleSendCurrentDownloads();
 
+  // Protected for testing.
+  virtual content::DownloadManager* GetMainNotifierManager();
+
  private:
   // Shorthand for |observing_items_|, which tracks all items that this is
   // observing so that RemoveObserver will be called for all of them.
   typedef std::set<content::DownloadItem*> DownloadSet;
 
   // Sends the current list of downloads to the page.
   void SendCurrentDownloads();
 
   // Displays a native prompt asking the user for confirmation after accepting
   // the dangerous download specified by |dangerous|. The function returns
@@ skipping 35 matching lines @@
 
   // Whether a call to SendCurrentDownloads() is currently scheduled.
   bool update_scheduled_;
 
   base::WeakPtrFactory<DownloadsDOMHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadsDOMHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_